Sputtering,Stalling,Slow accel. 1986 2.5L

[Zaze]

1986 Cherokee Comand-trac 2-dr 2.5l 4-cyl

Ok, well heres the thing: i first noticed my jeep was losing power in the first night(paper route) with a little sputtering up this one steep hill.
Then day 2 it started to idle really rough, like 2 seconds of good idle, then it rattles and wobbles, somtimes stalling, most the time just wobbling real bad-this is how it is now, mostly stalling though.

When i give it gas, it sounds almost like its skipping a spark, but ive put in new: Fuel pump, fuel filter, spark plugs/wires, distributer cap/rotor, fuel pump relays(which caused it to not start for a couple nights) The air intake/fuel injectors have been cleaned.

I would gain power when i let up off the gas, but now its so bad it isnt even doing that anymore.

If anyone knows about this, please get back to me asap!

--Zaze

[Dale Aeppli]

Originally Posted by Zaze

1986 Cherokee Comand-trac 2-dr 2.5l 4-cyl

Ok, well heres the thing: i first noticed my jeep was losing power in the first night(paper route) with a little sputtering up this one steep hill.
Then day 2 it started to idle really rough, like 2 seconds of good idle, then it rattles and wobbles, somtimes stalling, most the time just wobbling real bad-this is how it is now, mostly stalling though.

When i give it gas, it sounds almost like its skipping a spark, but ive put in new: Fuel pump, fuel filter, spark plugs/wires, distributer cap/rotor, fuel pump relays(which caused it to not start for a couple nights) The air intake/fuel injectors have been cleaned.

I would gain power when i let up off the gas, but now its so bad it isnt even doing that anymore.

If anyone knows about this, please get back to me asap!

--Zaze

HI, I HAD A 86 CHEROKEE LIMINTED 2.5 ONLY WITH SELECTRAC THE TWO THINGS SEEMED TO BE THE THROTTLE POSITION SENSOR AND THE MAP SENSOR. KEEP THE LINE FROM PCV VALVE CLEAN IT GOES RIGHT INTO BOTTOM OF THROTTLEBODY, HAS TO HAVE VACUUM AT ALL TIMES. I HAVE THE FACTORY PARTS BOOK FOR 86 CHEROKEE 4CYL. 2.8 V/6 DIESEL IF YOU NEED FACTORY #'S DALE [email protected]

[Zaze]

Well, i checked all the vacuum tubes connected to the throttlebody/carb(?} and the performance increases with each tube unplugged, each seperately.
When i unplug the PCV valve vacuum, the sputtering smooths out a little, but the valve itself works so its not that. It looked a little clogged but it has really strong suction.
When i unplug the MAP vacuum, it stops sputtering too, but i dont know if the MAP works or not, i dont know how to test it.

how do i tell if the MAP sensor is working or not?
how do i test the throttle position sensor?
what else can you suggest?

--Zaze

[Dale Aeppli]

Originally Posted by Zaze

Well, i checked all the vacuum tubes connected to the throttlebody/carb(?} and the performance increases with each tube unplugged, each seperately.
When i unplug the PCV valve vacuum, the sputtering smooths out a little, but the valve itself works so its not that. It looked a little clogged but it has really strong suction.
When i unplug the MAP vacuum, it stops sputtering too, but i dont know if the MAP works or not, i dont know how to test it.

how do i tell if the MAP sensor is working or not?
how do i test the throttle position sensor?
what else can you suggest?

--Zaze

HI, IF YOU EMAIL ME AT [email protected]---i'll send you a sheet on testing can email thru the formn dale [email protected]

[Zaze]

I talked to 4 mechanics and they all said it was my whole throttlebody....all of them played around with it until they came to the same conclusion. I also had to replace my fuel pressure regulator.....
throttle body at kragen was $430 but i found a pristine clean one at a junkyard for $24....car runs great now...